/*
 * Copyright (c) 2011, BeamSoft Team
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.b3log.solo.event.comment;

import java.util.logging.Level;
import java.util.logging.Logger;

import org.b3log.solo.SoloServletListener;
import org.b3log.solo.event.EventTypes;
import org.b3log.solo.model.Article;
import org.b3log.solo.model.Comment;
import org.b3log.solo.model.Preference;
import org.b3log.solo.repository.CommentRepository;
import org.b3log.solo.repository.impl.CommentGAERepository;
import org.b3log.solo.util.Preferences;

import com.google.appengine.api.mail.MailService;
import com.google.appengine.api.mail.MailService.Message;
import com.google.appengine.api.mail.MailServiceFactory;
import org.json.JSONObject;
import com.sunxboy.latke.Keys;
import com.sunxboy.latke.event.AbstractEventListener;
import com.sunxboy.latke.event.Event;
import com.sunxboy.latke.event.EventException;
import com.sunxboy.latke.event.EventManager;
import com.sunxboy.latke.util.Strings;

/**
 * This listener is responsible for processing article comment reply.
 *
 * @author <a href="mailto:DL88250@gmail.com">Liang Ding</a>
 * @version 1.0.1.1, Jan 12, 2011
 */
public final class ArticleCommentReplyNotifier
        extends AbstractEventListener<JSONObject> {

    /**
     * Logger.
     */
    private static final Logger LOGGER =
            Logger.getLogger(ArticleCommentReplyNotifier.class.getName());
    /**
     * Comment repository.
     */
    private CommentRepository commentRepository =
            CommentGAERepository.getInstance();
    /**
     * Mail service.
     */
    private MailService mailService = MailServiceFactory.getMailService();
    /**
     * Preference utilities.
     */
    private Preferences preferenceUtils = Preferences.getInstance();

    /**
     * Constructs a {@link ArticleCommentReplyNotifier} object with the
     * specified event manager.
     *
     * @param eventManager the specified event manager
     */
    public ArticleCommentReplyNotifier(final EventManager eventManager) {
        super(eventManager);
    }

    @Override
    public void action(final Event<JSONObject> event) throws EventException {
        final JSONObject eventData = event.getData();
        final JSONObject comment = eventData.optJSONObject(Comment.COMMENT);
        final JSONObject article = eventData.optJSONObject(Article.ARTICLE);
        LOGGER.log(Level.FINER,
                   "Processing an event[type={0}, data={1}] in listener[className={2}]",
                   new Object[]{event.getType(),
                                eventData,
                                ArticleCommentReplyNotifier.class.getName()});
        final String originalCommentId =
                comment.optString(Comment.COMMENT_ORIGINAL_COMMENT_ID);
        if (Strings.isEmptyOrNull(originalCommentId)) {
            LOGGER.log(Level.FINER, "This comment[id={0}] is not a reply",
                       comment.optString(Keys.OBJECT_ID));
            return;
        }

        try {
            final String commentEmail = comment.getString(Comment.COMMENT_EMAIL);
            final JSONObject originalComment =
                    commentRepository.get(originalCommentId);
            final String originalCommentEmail =
                    originalComment.getString(Comment.COMMENT_EMAIL);
            if (originalCommentEmail.equalsIgnoreCase(commentEmail)) {
                return;
            }

            final JSONObject preference = preferenceUtils.getPreference();
            if (null == preference) {
                throw new EventException("Not found preference");
            }

            final String blogTitle =
                    preference.getString(Preference.BLOG_TITLE);
            final String adminEmail =
                    preference.getString(Preference.ADMIN_EMAIL);

            final String commentContent =
                    comment.getString(Comment.COMMENT_CONTENT).
                    replaceAll(SoloServletListener.ENTER_ESC, "<br/>");
            final String commentSharpURL =
                    comment.getString(Comment.COMMENT_SHARP_URL);
            final Message message = new Message();
            message.setSender(adminEmail);
            message.setTo(originalCommentEmail);
            final String mailSubject = blogTitle + ": New reply of your comment";
            message.setSubject(mailSubject);
            final String articleTitle = article.getString(Article.ARTICLE_TITLE);
            final String blogHost = preference.getString(Preference.BLOG_HOST);
            final String articleLink = "http://" + blogHost + article.getString(
                    Article.ARTICLE_PERMALINK);
            final String commentName = comment.getString(Comment.COMMENT_NAME);
            final String commentURL = comment.getString(Comment.COMMENT_URL);
            String commenter = null;
            if (!"http://".equals(commentURL)) {
                commenter = "<a target=\"_blank\" " + "href=\"" + commentURL
                            + "\">" + commentName + "</a>";
            } else {
                commenter = commentName;
            }
            final String mailBody =
                    "Your comment on article[<a href='" + articleLink + "'>"
                    + articleTitle + "</a>] received an reply: <p>" + commenter
                    + ": <span><a href=\"http://" + blogHost + commentSharpURL
                    + "\">" + commentContent + "</a></span></p>";
            message.setHtmlBody(mailBody);
            LOGGER.log(Level.FINER,
                       "Sending a mail[mailSubject={0}, mailBody=[{1}] to [{2}]",
                       new Object[]{mailSubject, mailBody,
                                    originalCommentEmail});
            mailService.send(message);

        } catch (final Exception e) {
            LOGGER.log(Level.SEVERE, e.getMessage(), e);
            throw new EventException("Reply notifier error!");
        }
    }

    /**
     * Gets the event type {@linkplain EventTypes#ADD_COMMENT_TO_ARTICLE}.
     *
     * @return event type
     */
    @Override
    public String getEventType() {
        return EventTypes.ADD_COMMENT_TO_ARTICLE;
    }
}
